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| 1 | Immobilization of 12-phosphotungstic heteropolyacid onamine-functionalized SiO_2 for tetrahydrofuran polymerization显示文摘The 12-phosphotungstic heteropolyacid(HPW)was immobilized on the surface of a silica carrier modified by the amine groups of organosilaneγ-aminopropyl triethoxysilane(APTES),and its catalytic performance was investigated for tetrahydrofuran(THF) ring-opening polymerization.This amine-functionalized catalyst exhibited better activity,and the polytetramethylene ether glycol (PTMG)yield was 63.7%.The 12-phosphotungstic heteropolyacid supported on aminopropyl-functionalized SiO2 support (HPW/SiO2-APTES)was reused four times and showed a good maintenance of activity which was better than that of the conventional catalyst HPW supported on SiO2(HPW/SiO2).These results were obtained using infrared spectroscopy,nuclear magnetic resonance spectroscopy,nitrogen adsorption and X-ray diffraction.HPW on the HPW/SiO2-APTES catalyst exhibited higher dispersed state and maintained a more stable structure than that of the HPW/SiO2 sample. | HUANG Ming CHU Wei LIAO XueMei DAI XiaoYan | 2010 | Chinese Science Bulletin2010，55，24： | 2 |
| 2 | SiW/ZrO_2/MCM-41催化苯甲醚酰化反应显示文摘采用逐层浸渍法制备了MCM-41介孔分子筛负载ZrO2及硅钨酸(SiW)催化剂,考察了催化剂在以苯甲醚为原料、乙酸酐为酰化试剂的Friedel-Crafts酰化反应中的催化活性,同时对催化剂进行XRD、N2吸-脱附测试、DSC、FTIR、NH3-TPD等表征,研究了ZrO2与SiW及载体之间的相互作用对催化剂活性的影响。实验结果表明,SiW直接负载到MCM-41后,SiW与载体发生相互作用使Keggin结构发生畸变,导致活性下降;但SiW通过ZrO2接枝负载到MCM-41后,SiW较好地分散在载体表面且保持了完整的Keggin结构,SiW与ZrO2间的相互作用增加了催化剂上强酸中心的数目,显著提高了催化活性。催化剂的最佳制备条件为:ZrO2负载量20%(w),SiW负载量60%(w),焙烧温度200℃;最佳反应条件为:反应时间4 h,反应温度110℃,催化剂用量为0.2 g(基于10 mmol乙酸酐),苯甲醚与乙酸酐的摩尔比10。 | 汤明慧 张波 吴磊 | 2013 | 石油化工2013，42，7： | 0 |
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